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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 08-09-2008, 06:31 PM   #1
j0n228
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how to improve mpg

hi guys i got 120k miles on my car and im getting 17.5 mpg i wanted to know what the best thing to do to help improve mpgs besides driving slower like what can i change to help improve this and get it to where its sapouse to be like 23 mpgs
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Old 08-09-2008, 06:36 PM   #2
reez777
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I'm not sure if this will work for all E46 owners, but I increased my MPG from 20 to 25.5 by doing two things

i) taking the spare wheel out of the car.
ii) taking my girlfriend out of the car.

Weight Loss of the two items combined was enough to get my MPG shooting up.
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Old 08-09-2008, 06:37 PM   #3
j0n228
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iight can someone be a better help
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Old 08-09-2008, 06:40 PM   #4
kartele
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check your tire pressure, I filled my tires on my daily driver a couples of psi below the max. got me some more mpgs. Rides a little rougher but its just my work car so its cool
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Old 08-09-2008, 07:04 PM   #5
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if you are approaching a red light from a good distance, just free ride it to the light, chances are it will turn green by the time you approach the light without coming to a halt and accelerating off.
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Old 08-09-2008, 07:38 PM   #6
Alex323Ci
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tire pressure and spark plugs.

A/C and windows up after 40mph. no A/C and windows down less than 40mph.

gear oils changed to high grade synthetics helped some too.
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Old 08-09-2008, 07:49 PM   #7
CirrusSR22
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Do you still have the original oxygen sensors at 120,000 miles? Fresh ones help.
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Old 08-09-2008, 08:01 PM   #8
gferil
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Also, if you are going to do spark plugs (which helped me to improve my mileage a bit and improved response too), then you might as well clean the MAF sensor, replace the fuel filter, and if you haven't already, replace the air filter. Plus what all the other people said above...
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Old 08-09-2008, 09:11 PM   #9
GrayGhost
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Reduce the use of the biggest gas waster in your car... the brakes. Every time you get on the brakes some amount of gas is effectively going up in wasted heat. Watch traffic and signals way ahead and drive so as to miminize the need to use the brakes. Coasting to a stop and then accelerating (gently) away cost very little gas, but staying on the gas until you have to get on the brakes hard to stop is just throwing gas away.
I average 25 - 27 mpg in suburban driving and 32 - 33 on the interstates.
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Old 08-09-2008, 09:25 PM   #10
sandman0615
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^ 27 city thats pretty good im usually 22mpg. i picked up my boy at laguardia about 90 mins away trying to get good mileage and i clocked 37mpg i couldnt believe it
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Old 08-09-2008, 09:37 PM   #11
Squeak
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using GOOD gas also improves millage. dont use regular!!
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Old 08-09-2008, 09:47 PM   #12
SteveX82
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Originally Posted by squeak007 View Post
using GOOD gas also improves millage. dont use regular!!
Funny...my last fillup on regular netted 31.9mpg. YMMV (pun)
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Old 08-09-2008, 09:51 PM   #13
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Quote:
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Funny...my last fillup on regular netted 31.9mpg. YMMV (pun)
REALLY, hmm i just heard that some where. o well
but you put regular IN A BMW.... TISK TisK
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Old 08-09-2008, 10:32 PM   #14
TheBrooklynZoo
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A/C and windows up after 40mph. no A/C and windows down less than 40mph.
what does that mean?
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Old 08-09-2008, 10:33 PM   #15
GoingNuts
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You can buy a driver upgrade to get better mpg. An upgraded driver should get around 25mpg in city driving. The upgrade can be DIY'ed and will cost about 50% of your ego. But you can keep the AC on at full blow at all times to keep the bruised ego cool.

Last edited by GoingNuts; 08-09-2008 at 10:37 PM.
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Old 08-09-2008, 11:29 PM   #16
blingman
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what does that mean?
It means to use air conditioner and roll up all the windows if your driving 40mph or higher and if not going that fast, roll windows down and turn air conditioner off to save gas. At high speed, having all the windows up will reduce drag even though you will have the air conditioner on, it will still save gas in the long run.
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Old 08-09-2008, 11:33 PM   #17
NOVAbimmer
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REALLY, hmm i just heard that some where. o well
but you put regular IN A BMW.... TISK TisK
regular gas isn't going to hurt it
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Old 08-09-2008, 11:38 PM   #18
kurtnhl
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I have always thought spending money on things that are not part of maintenance was pointless, since you could spend that money on gas. The only thing that I have noticed that helps is changing ones driving style. Maybe instead of trying to save money on guess, cut out other needless spending in your life and use that for gas money. (not saying that you have any)
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Old 08-10-2008, 10:05 AM   #19
maxm50
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Originally Posted by j0n228 View Post
hi guys i got 120k miles on my car and im getting 17.5 mpg i wanted to know what the best thing to do to help improve mpgs besides driving slower like what can i change to help improve this and get it to where its sapouse to be like 23 mpgs
Switching over to using proper punctuation increased my mileage by at least 2-3 mpg.
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Old 08-10-2008, 10:28 AM   #20
jamesthebikeguy
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Check those O2s

I bet the pre-cats could use some love.
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